import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'list 学习',
        home: Scaffold(
          appBar: AppBar(title: Text('aaa')),
          body: new Row(
            children: <Widget>[
              Expanded(
                child: new RaisedButton(
                  onPressed: () {},
                  color: Colors.amber,
                  child: Text("asdasdasd"),
                ),
              ),
              Expanded(
                child: new RaisedButton(
                  onPressed: () {},
                  color: Colors.amber,
                  child: Text("asdasdasd"),
                ),
              ),
              Expanded(
                child: new RaisedButton(
                  onPressed: () {},
                  color: Colors.amber,
                  child: Text("asdasdasd"),
                ),
              ),
            ],
          ),
        ));
  }
}
